Insulating unit



April 21, 1931. w, EHNELSON INSULATING UNIT Filed Sept. 24, 1927 [m emof W/ZZ/AM Z. NFL Jo/v 9 GEL. EM MM ALLOY/rev:

Patented Apr. 21, 1931 WILLIAM E. NELSON, OF IIINNEAPOLIS, MINNESOTA IN SULALING UNIT Application'flled September 24, 1927. Serial No. 221,771.

This invention relates to new and useful improvements in insulating units or slabs par- I the form shown in my pending application,

Serial .No. 218,230, filed September 8th, 1927. An object of the present invention is to provide an insulating unit or slab which may be manufactured at a minimum cost, and comprises a suitable non-conductive, dry, fibrous filler, having its opposite ends enclosed in suitable waterproof end caps, and the central 1 portion of said filler being enclosed in an open-ended casing having its ends overlapping the walls of said end caps and secured thereto by a suitable water-proof material, such as tar or asphalt, whereby the joints between the casingsl1eet and the end caps will be sealed against moisture.

A further object of the invention is to provide an insulating unit or slab comprising a plurality of dry fibrous filler sheets stacked one upon the other to provide a nonconductive body, and water-proof caps of flexible material enclosing the opposite ends of said body, and a casing also of water-proof ma terial disposed about the central portion of said body with its opposite edges overlapping the walls of said end caps, and preferably, but not necessarily, secured thereto by a suitable water-proof material, to prevent the 'entrance of moisture into said body.

Other objects of the invention will appear from the following description and accompanying drawings and will be pointed out in' the annexed claims.

In the accompanying drawings, there has been disclosed a structure designed to carry out the various objects of the invention, but it is to be understood that the invention is not confined to the exact features shown as various changes ma be made within the sco of the claims w ich follow.

Iii the accompanying drawings forming part of this specification; v

Figure 1 is a perspective view showing the filler sheets arranged in superposed relation and the end caps fitted over the ends thereof;

Figure 2 is a view similar to Figure 1, showing the casing sheet wrapped about the filler sheets and overlapping the walls of the end ca s;

figure 3 is a View showing the completed uni Figure 4 is a sectional view on the line 4-4 of Figure 3;

Figure 5 is a modified form showing the end caps fitted over the opposite edges of the casing sheet; and

Figure 6 is another modification showing the use of channel-shaped caps instead of the form shown in Figure 1.

The novel insulating unit or slab featured in this invention comprises a non-conductive dry fibrous body or filler, preferably consist ing of a plurality of felted sheets 2, arranged in superposed abutting relation, as shown in Figure 1. Water-proof end caps 3, preferably formed of flexible material, are mounted upon the opposite ends of the body or filler as, shown in Figure 1 and enclose the ends of the filler. sheets 2 to protect them against moisture.

A water-proof casing sheet 4 is wrapped about the filler sheets 2 with its opposite edges 5 and 6 overlapping the side walls 7 and the end walls 8 of the end caps 3, as shown in Figure 2. A coating 9 of asphalt or tar is applied to the outer surfaces of the walls 7 and 8 of the end caps 9 and also to one end of the casing sheet 4, so that when the latter is engaged with the end caps 3 and the ends there of are overlapped, as shown in Figure 2, the casing sheet will be securely united to the end caps 3, thus providing a water-proof casing for the filler sheets. If desired, the opposite edges of the casing sheet 4 may be coated with a suitable water-proof material, such as tar or asphalt to further render the unit waterproof.

Figure 3 illustrates the unit in its completed form. The shaded portions 10 indicate a coating of tar-or asphalt, which may be applied to the joints exteriorly of the unit to further prevent the entrance of moisture into the filler sheets.

Figure 5 illustrates a modified form wherein the casin sheet 4 is first wrapped around sheet being sealed to each of said water-proof K the filler s eets and its overlapping ends caps about the erimeter thereof.

united, after which the end caps 11 are fitted n witness w ereof, I have hereunto set my over the ends thereof and secured thereto by a. hand this 17th day of Se tember, 1927. I coating 12 of tar or asphalt to render the cas- WILLIA E. NELSON. 70

ing moisture-proof.

igure 6 illustrates another modified form wherein channel-shaped caps 13 are fitted over the side edges of the unit and cooperate I with'the end caps 3 to bind the filler sheets 76 together as a unit. A coating of tar or ashalt ma then be applied to the outer sur- Eaces of the filler sheets and caps 3 and 13 to prevent the entrance of moisture into the unit. 15 The ca s 3, 11, and 13 are preferably con- 80 structe of water-proof material such as building paper but, if desired, they ma be constructed of non-water-proof materia in which case theunit may be dipped in tar or as halt to render it water-proof. 85

he insulating unit or slab above described may be manufactured at a comparatively low cost and provides a very practical insulation in the construction of refrigerators and other 26 apparatus of a similar character. It may 90 also be used as an insulation in the construction of walls, floors, ceilings, and roof structures. In practice, the units are manufactured to the required size for a given installa- I 30 tion in order to avoid cutting, which would 95 render the unit non-waCer-proof.

I claim as my invention: 1. An insulating unit comprising a lurality of separate, substantially flat, pre 'erably fibrous sheets arranged in su erposed and en- 100 gaging relation, water-proo caps fitted over the ends of said fibrous sheets to bind them to gether and to protect said ends from moisture, and a coating of water-proof material ap- 40 plied about the full length of the perimeter m5 of the superposed sheets of said unit between said water-proof caps and in overlapping and sealing relation with said caps.

2. An insulating unit comprising a plurality of separate, substanially flat, preferably no fibrous sheets arranged in su erposed and engaging relation, water-pros caps fitted over the ends of said fibrous sheets to bind them together and to protect said ends from moisture, and a water-proof casing sheet applied about the full length of the perimeter of the superposed sheets of said unit between said water-proof caps and in overlapping and sealing relation with said caps.

65 3. An insulating unit comprising a plurality of separate, substantially flat, preferably fibrous sheets arranged in superposed relation, water-proof caps of flexible material mounted upon and enclosing the opposite a0 ends of said sheets to bind them together and 25 a water-proof casing sheet applied about the full length of the perimeter of the superposed sheets of said unit between said water-proof caps and in overlap ing relation with said 5 caps, the opposite en portions of said casing I 

